and israel's air force has stepped up its bombardment. it calls these precision strikes on terror targets-- weapons dumps and launch sites. but in crowded gaza, civilians are suffering too. there is no such thing as a war in which innocents escape. omar was just 11 months old, a happy and smiling boy, his mother says. now, she is lost in grief, her son a her sister in law died when an israeli shell crashed through their roof and began an all consuming inferno. an older brother survived, no one in the family can bear to tell him what happened. >> we have rockets here, we have guns? around my place, we don't have any resistance. all of them is civilians. just civilians. >> reporter: tonight, palestinian rockets are reaching ever closer to israel's heart. sirens sounding over tel aviv, the biggest city. authorities have told residents to be ready to run to shelters. meanwhile israel is massing forces at the gaza border, their presence a warning to hamas and perhaps a statement of intent, too. >> suarez: after nightfall in the region, israeli